- Add a stroke as a layer style that is as thick as the corner radius you
would like
If you’d like to flatten the object to remove the stroke, keep following the
steps below.
- Create a new layer
- In the Layers palette, select the new layer and the previous layer
- Merge layers (Command + E)
It’s possible to automate the flattening with a Photoshop Action. This can
also be set up as a function key to speed things up further.
A huge advantage of the stroke method is that it’s dynamic, so the radius
can be edited in real time. It can also be used to easily create other
rounded shapes, as seen below.